Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

468
FXUS63 KLOT 292259
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
559 PM CDT Fri May 29 2026

.KEY MESSAGES...

- A stagnant, predominantly precipitation free pattern will
  prevail through at least mid next week, with seasonably warm
  daytimes inland, and cooler temperatures closer to the lake.

- Hazardous to dangerous swimming conditions are anticipated at
  Lake Michigan beaches on Saturday, particularly in Illinois.

&&

.DISCUSSION...
Issued at 105 PM CDT Fri May 29 2026

The only real item of note for the next few to several days
will be another round of dangerous swimming conditions at Lake
Michigan beaches on Saturday behind a backdoor cold frontal
passage. The large waves and strong currents will be focused
onto the Illinois shoreline this time, where a Beach Hazards
Statement is in effect from 7 AM to 9 PM Saturday.

Otherwise, persistent western CONUS troughing and northeastern
North America troughing will continue to result in a sharp
"omega block" type ridge extending into central Canada through
midweek next week. At the surface, expansive, seasonably strong
high pressure from Hudson Bay to the Great Lakes will result in
very little change in daytime temps (seasonable to above average
warmth inland though cooler near the lake) and unseasonably low
dew points as we transition into meteorological summer. This
will also result in several more comfortable overnight-early
morning periods outside of Chicago.

Synoptic easterly low level flow will keep better column and
low level moisture, and most associated precip chances, west of
the MS River. A possible minor exception to this will be late
Sunday and especially Sunday night when some spotty showers
could sneak into the southwest 1/4 or so of the CWA. The
blocking pattern looks to temporarily break down later next
workweek. This should set the stage for some threat for showers
and thunderstorms in the Thursday night through Friday evening
time frame as a cold front pushes across the area. With
stronger large scale forcing currently progged to pass well to
our north, prospects for widespread beneficial rainfall with the
late week front don`t look all that promising.

Looking beyond Friday, another similar blocky regime to the
current pattern may set up next weekend onward. This will be
something to monitor water resources and soil moisture wise, as
persistent dryness and strong evapotranspiration this time of
year can and has led into rapid onset drought. As such, CPC has
highlighted northern IL and southern WI for this in its day
8-14 hazards outlook.

Castro

&&

.AVIATION /00Z TAFS THROUGH 06Z SUNDAY/...
Issued at 559 PM CDT Fri May 29 2026

VFR conditions expected through the 00z TAF cycle.

Light, mostly easterly winds are expected tonight. A secondary
cold front will move across the regional Saturday morning. The
only impact will be a slight increase in east northeast winds
behind the front, most notable for the terminals closer to Lake
Michigan. Otherwise, high clouds (based near 25kft) will
continue through the TAF period.

- Izzi/Borchardt

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Beach Hazards Statement from Saturday morning through Saturday
     evening for ILZ006-ILZ103-ILZ104.

IN...None.
LM...Small Craft Advisory from 7 AM to 9 PM CDT Saturday for the IL
     nearshore waters.

&&

$$

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